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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d9e776a6a3653bf077e30be0738c52a48eb37dcff10c7d7f3c9cb3cdc27ba05' 
  AND token = 'INf8Z/D4T8ewLA0C+ybGmltf80aQNfN05mE1zLygu30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}